Hello,
I discovered the (wonderful) animation module in the v1.1 release today.
However I think I may have quickly outgrown it a bit!
I am plotting some simulation data see:
http://dl.dropbox.com/u/2796140/mhdmodes_3.mp4 for an example made with the
animation class.
There is one thing missing from the above, which is colour bars!
I have created the animation using the ArtisitAnimation class because each
frame takes about 1-2 seconds to calculate the magnetic field lines, so
using FuncAnimate would result in a very slow animation.
The problem is that I can not add a colorbar instance to the list of
artists that the animator draws as it is not an artist instance.
This is a slightly modified version of the example [
http://matplotlib.sourceforge.net/examples/animation/dynamic_image2.html]
that shows my problem:
#!/usr/bin/env python
>
> """
>
> An animated image
>
> """
>
> import numpy as np
>
> import matplotlib.pyplot as plt
>
> import matplotlib.animation as animation
>
> fig = plt.figure()
>
> def f(x, y):
>
> return np.sin(x) + np.cos(y)
>
> x = np.linspace(0, 2 * np.pi, 120)
>
> y = np.linspace(0, 2 * np.pi, 100).reshape(-1, 1)
>
> # ims is a list of lists, each row is a list of artists to draw in the
>
> # current frame; here we are just animating one artist, the image, in
>
> # each frame
>
> ims = []
>
> for i in range(60):
>
> x += np.pi / 15.
>
> y += np.pi / 20.
>
> im = plt.imshow(f(x, y))
>
> cb = plt.colorbar()
>
> ims.append([im, cb])
>
> ani = animation.ArtistAnimation(fig, ims, interval=50, blit=True,
>
> repeat_delay=1000)
>
> plt.show()
>
>
Which generates the following error
> Traceback (most recent call last):
> File "/home/stuart/Documents/VAC/sac_anim_axtest.py", line 28, in
> <module>
> repeat_delay=1000)
> File "/usr/lib64/python2.7/site-packages/matplotlib/animation.py", line
> 356, in __init__
> TimedAnimation.__init__(self, fig, *args, **kwargs)
> File "/usr/lib64/python2.7/site-packages/matplotlib/animation.py", line
> 304, in __init__
> Animation.__init__(self, fig, event_source=event_source, *args,
> **kwargs)
> File "/usr/lib64/python2.7/site-packages/matplotlib/animation.py", line
> 53, in __init__
> self._init_draw()
> File "/usr/lib64/python2.7/site-packages/matplotlib/animation.py", line
> 363, in _init_draw
> artist.set_visible(False)
> AttributeError: Colorbar instance has no attribute 'set_visible'
>
I attempted to add the colorbar to a AxesSubplot instance and then draw the
axes in the artist list, however when I add a Axes instance to the artist
list I get a wonderful error:
Traceback (most recent call last):
> File
> "/usr/lib64/python2.7/site-packages/matplotlib/backends/backend_gtk.py",
> line 122, in _on_timer
> TimerBase._on_timer(self)
> File "/usr/lib64/python2.7/site-packages/matplotlib/backend_bases.py",
> line 1092, in _on_timer
> ret = func(*args, **kwargs)
> File "/usr/lib64/python2.7/site-packages/matplotlib/animation.py", line
> 315, in _step
> still_going = Animation._step(self, *args)
> File "/usr/lib64/python2.7/site-packages/matplotlib/animation.py", line
> 177, in _step
> self._draw_next_frame(framedata, self._blit)
> File "/usr/lib64/python2.7/site-packages/matplotlib/animation.py", line
> 197, in _draw_next_frame
> self._post_draw(framedata, blit)
> File "/usr/lib64/python2.7/site-packages/matplotlib/animation.py", line
> 220, in _post_draw
> self._blit_draw(self._drawn_artists, self._blit_cache)
> File "/usr/lib64/python2.7/site-packages/matplotlib/animation.py", line
> 235, in _blit_draw
> a.axes.draw_artist(a)
> File "/usr/lib64/python2.7/site-packages/matplotlib/axes.py", line 1994,
> in draw_artist
> assert self._cachedRenderer is not None
> AssertionError
>
I also saw the subplots animation example [
http://matplotlib.sourceforge.net/examples/animation/subplots.html],
however that is also based on FuncAnimate, would there be a way to create
something similar for ArtistAnimate?
Thanks
Stuart
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